Post coital exhaustion

Yesterday around 1pm my fwb and I had sex. The sex was intense and short. 5 minutes max as we were at a public park in his truck. He has been gone working on an oil rig for the past 2 weeks so that may be why this happened. Pretty much right after sex I was exhausted, I couldn’t talk and I felt like I was floating. Now I’ve had an orgasm before and maybe I did have an orgasm or came close to it yesterday during sex. I’m not sure. I did maybe 30% of the work and he did 70% and it was pretty rough so that may be why I feel so exhausted. I also feel sore today. Has this happened to anyone else?